Spiral pipe.



No. 784,128. 7 PATENTED MAR. 7, 1905. J. H. TAYLOR.

, SPIRAL PIPE.

APPLICATION FILED FEB. s, 1900. RENEWED 12.11.23. 1005.

fiveizfaz I Ji Jfl Z 07; Q g 15 m $23256 .ln'rrnp drarne Patented March7., 1905.

SPINAL PIPE...

SPECIFICATION forming part of Letters Patent No. 78 1,1528, dated March'7, 1905.

Application filed February 3, 1900.

To 11]] whmn it may {BOTH/(3771,.

Be 1t known that I, JAMES HALL TAYLOR,

a citizen of the United States, residing at Chicago, in the county ofCook and State of Illinois, have invented a certain. new and usefulImprovement in Spiral Pipe, (Case No. 2,) of which the following is afull, clear, concise, and exact description, reference being had to theaccompanying drawings, form ing a part of this specification.

My invention relates to spiral pipe, and has for its object theprovision o'f-an improved pipe of this class which possesses greatstiffness and in which the strain acting upon the various parts thereofis evenly distributed.

More particularly, my invention relates to that class of spiral pipe inwhich the adjacent edges along the spiral seam thereof are locked and.securely held in place by means of an auxiliary bar or bender engagingthe said adjacent edges.

My invention has for its prime object the provision of an improved pipeor tube formed of commercial sheet metal. The pipe is formed of a ribbonof sheet metal wound spirally, the bond engaging the adjacent edges ofthe spirally-wound ribbon.

Heretofore tubing has been made of sheet metal folded to form the tube,a longitudinal seam being formed at the meeting edges of the metal,whichare suitably bonded together. This construction does not provide a pipeor tube which possesses great strength or stiffness, inasmuch as a pipeof this construction may readily be distorted and bent out of shape whensubject to considerable external pressure. In the construction of mypresent invention the spiral arrangement of the sheet metal and the bondor locking-bar employed to unite the adjacent edges thereof consti tutea pipe that will readily resist great pressure externally, as well as towithstand an increased internal pressure. The direction of internalpressure in the pipe of my improved construction acts more nearly in aline parallel to the fibers of the said sheet metal.

It is the further object of my invention to provide a pipe in which thetendency of the auxiliary locking means is adapted. to grip portion ofthe pipe.

Renewed January 23, 1905. Serial No. 24:2,323.

firmly and securely the adjacent edges of the metal. ribbon forming thepipe, thus securely holding the adjacent edges of the metal ribbon inplace to form. a crmtinuous pipe.

Generally speaking, my invention consists of a spirally-wound pipe, theadjacent edges along the spiral seam thereof being n'eferably ofincreased cross-section, a locking-bar preferably inclosing thoseportions of increased cross-section serving to keep the adjacent bonded.edges in alinement and se curely holding them in place. i preferablycorrugate the surfaces along the portions of.

increased cross-section of the said pipe, so that the locking-bar maybeadapted to more firmly engage the said adjacent edges.

I. obtain the aforesaid objects, and others which will be apparent, bymeans of the construction which I will now describe in connection withthe accompanying drawings, illustrating the preferred embodimentthereof,in which--- Figure 1 is a longitudinal view of a finished Fig. 12 is alongitudinal sectional view through the center line thereof. Fig. 3 is adetailed sectional view showing the connection between the locking-barand adjacent edges of the said metal. Fig. 41; is a cross-sectional viewon line 4L 4 of Fig. 1.

Fig. 5 is a sectional view showing a modification of the form of jointillustrated in Fig. 3. Fig. 6 is a sectional view illustratin a step inthe process of the manufacture of the pipe. Fig. 7 is a cross-sectionalview of a blank. from which. the pipe may be formed. Fig. a is a partialtop view of the material as shown in. Fig. 7, illustrating in detail thecorrugations along an edge thereof.

Like characters of reference indicate like parts throughout the views.

In the preferred embodiment of my inven tion the finished pipe (1., asshown in Fig. 1, consists of sheet metal I), spirally wound to formtubing. The two edges of the said sheet metal consist, preferably, ofportions 0 c of increased cross-seetion, the said portions of increasedcross-section being preferably obtained by doubling the longitmlimiledge portions of the ribbon. The adj aeent edges 0 c of the sheet metalI) are preferably not in.

direct engagement, a locking-bar d being inserted between the saidadjacent edges and being preferably provided with extensions or lips e6, extending longitudinally of the said bar and forming a groove thereinwhich are adapted to overlap, mclose, and firmly grip the said portionsof increased cross-section c c. The adjacent edges of the material arethus firmly secured in position by means of the said locking-bar d, thelocking-bar being preferably forced into engagement with the saidadjacent edges 0 0 under the influence of pressure, the locking-barthereby entering and filling up suitable depressions or corrugationsfpreferably provided along the portions of increased cross-section 0 uponthe sheet metal I). The corrugations as most clearly shown in Figs. 7and 8, are placed along the edges 0 and are preferably of such size anddepth that the locking-bar (Z when engaging the same securely holds thepipe in position and overcomes any tendency thereof to increase itsdiameter. The portions of increased cross-section c c serve when inengagement with the locking-bar (Z to prevent any longitudinaldisplacement between two adjacent portions of the material b.

To facilitate the manufacture of the pipe, the locking-bar (Z may bepreferably con structed with one of its projecting edges or lips ginclined at an abrupt angle, as shown most clearly in Figs. 2 and 6, sothat the sheet metal which is to be formed into tubing may readilyengage this portion of the locking-bar as the sheet metal is spirallywound, the said lip 9 being then pressed into engagement.

It will be seen that my improved structure is adapted toeffectivelyresist a great amount of both external and internal pressurewithout changing its normal shape, inasmuch as the forming of thelocking-bar into position about the edges of the material to be formedinto pipe tends to place the inner portion thereof under compression andthe external portion thereof under tension, thereby more securelypressing the said internal portion against the interior of the pipe andlikewise more securely bringing the external portion into engagementwith the external portion of the pipe.

In Fig. 5 I have shown another embodiment of the invention, in which theedges 0 c of the material I) are shown as upset to greater thicknessinstead of being doubled. In this construction the corrugationsf arealso preferably formed in the thickened edges of the metallic ribbon.

I have herein shown and particularly described the preferred embodimentof my in- Having thus described my invention, what I claim as new, anddesire to secure by Lettcrs Patent, 1s-

1. As a new article of manufacture, a pipe consisting of spirally-woundsheet metal, and a spirally-wound locking-bar interposed betweenadjacent and separated spiral edges of the sheet metal and projectingwithin the interior of the pipe and projecting beyond'the outer contourthereof, the inner portion of said bar being compressed and the outerpart expanded, substantially as and for the purpose set forth.

2. As a new article of manufacture, a pipe comprising spirally-woundsheet metal, and a spirally-wound double-jawed locking-bar bondingadjacent and separated spiral edges of the sheet metal, the said barbeing provided with grooves formed longitudinally therein in which theadjacent spiral edges of the sheet metal are engaged, said barprojecting within the interior of the pipe and projecting beyond theouter contour thereof, the inner portion of said bar being compressedand the outer part expanded, substantially as and for the purpose setforth.

3. As a new article of manufacture, a pipe comprising spirally-woundsheet metal, the edges of the said sheet metal being formed intoportions of increased crosssection, and a spirally-wound double-j awedbar interposed between adjacent and separated edges of the'said pipealong the spiral seam thereof, the said bar being provided withextensions or lips for engaging said portions of increasedcross-section, said bar pro ecting within the interior of the pipe andprojecting beyond the outer contour thereof, the inner portion of saidbar being compressed and the outer part expanded, substantially as andfor the purpose set forth.

4. As a new article of manufacture, a pipe comprising spirally-woundsheet metal, and a locking-bar bonding the adjacent spiral edges of thesheet metal, the said bar being provided with grooves formedlongitudinally therein, the edges of the said sheet metal be ing ofincreasedcross-section and inclosed by the opposed walls of the saidgrooves, the surfaces of the said portions of increased cross-sectionbeing corrugated, substantially as described.

5. As a new article of manufacture, a pipe comprising spirally-woundsheet metal, the edges of the said sheet metal being formed intoportions of increased cross-section, and a bar interposed betweenadjacent edges of the said pipe along the spiral seam thereof, the saidbar being provided with extensions or lips for engaging said portions ofincreased cross-section, the surfaces of the said portions of increasedcross-section being corrugated, substantially as described.

6. As a new article of manufacture, apipe consisting of spirally-Woundsheet metal, the edges of the said sheet metal being corrugated, and alocking-bar provided with extensions or lips for engaging saidcorrugated spiral seam thereof, for holding the same in place,substantially as described.

In Witness whereof I hereunto subscribe my name this 31st day o'l.January, A. D.

5 portions, substantially as described. 1900.

7. As a new article of manufacture, a pipe r w r coniiprisingspirally-wound sheet metal, the JAMEb lAYLOR edges of the said sheetmetal being corru- Witnesses: gated, and a locking-bar interposedbetween FLORENCE WIOKLIN,

10 the edges of the said sheet metal along the 1 MAX W. ZABEL.

